Journal
IONICS
Volume 27, Issue 3, Pages 1013-1023Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-021-03902-8
Keywords
Li-ion battery; Al-Si alloy; Silicon; graphite; Anode; Ternary composite
Funding
- National Natural Science Foundation of China [21706292]
- Hunan Provincial Science and Technology Plan Project, China [2016TP1007]
- Hunan Provincial Natural Science Foundation of China [2020JJ4107]
- Innovation-Driven Project of Central South University [2020CX037]
- Fundamental Research Funds for the Central Universities of Central South University [2019zzts448]
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Porous nitrogen-doped-carbon-coated nano-Si/graphite ternary composites were successfully prepared and exhibited a highly stable specific capacity and good rate performance, showing promising applications in lithium-ion batteries.
Porous nitrogen-doped-carbon-coated nano-Si/graphite ternary composites were prepared by liquid-phase stirring, high-temperature calcination, and acid etching. At the Si and graphite mass ratio of 1:5 in the ternary composites, porous nitrogen-doped-carbon-coated nano-silicon particles were uniformly distributed into the graphite framework, which not only acts as active material for lithium storage but also provides high conductivity for Si particles. The porous amorphous nitrogen-doped carbon shells could further enhance both lithium ion and electrical conductivity of the composite and could also effectively relieve the volume expansion. The composite anode exhibited a highly stable specific capacity of 500 mAh g(-1) after 1000 cycles with the capacity retention of 95.5% at a high current density of 2000 mA g(-1). It also delivered a good rate performance of 739, 662, 589, and 507 mAh g(-1) at the current densities of 300, 500, 1000, and 2000 mA g(-1), respectively.
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